v0.26.16 — TeamMember privacy defaults

v0.26.16 is a patch release that hardens TeamMember privacy defaults
so derived projects do not commit ambient human identity data by default.

Changed

• Human TeamMember creation and update now store repo-visible identity as
  alias-only metadata by default: the committed display name is the slug,
  and email/handle are dropped unless the caller explicitly passes
  allow_committed_pii=true.
• The human TeamMember template now uses a generic human-user alias,
  disables memory and export by default, and omits personal contact
  placeholders.
• Team-manager guidance now states that humans must not be auto-created
  from ambient host, git, or harness identity.

Fixed

• Added a team.privacy.committed_pii consistency warning, surfaced
  through pk-doctor's team_consistency category, for legacy human
  TeamMembers that still contain repo-visible personal identity fields
  without explicit opt-in.

Verification

• python3 -m py_compile context/skills/processkit/team-manager/mcp/server.py context/skills/processkit/team-manager/scripts/consistency.py context/skills/processkit/pk-doctor/scripts/checks/team_consistency.py
• uv run --with pyyaml --with jsonschema --with pytest --with mcp pytest context/skills/processkit/team-manager/scripts/test_team_manager.py -q
• uv run --with pyyaml --with jsonschema --with pytest --with mcp pytest src/context/skills/processkit/team-manager/scripts/test_team_manager.py -q
• uv run context/skills/processkit/pk-doctor/scripts/doctor.py --category=team_consistency
• bash scripts/check-src-context-drift.sh --release-deliverable

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